Machine for grinding shimer-molding bits



(No Model.)

11,. 0. GILBERT, MACHINE FOR GRINDING SHIMER'MOLDING BITS, 8:0.

' Patented Apr. 2,

ATENT .ZFricE.

I-IIRAM GILBERT, OF BURLINGTON, VERMONT.

MACHINE FOR GRINDING S HlMER-MOLDING BITS, 81,0.

SPECIFICATION forming part of Letters Patent No. 400,660, dated April 2,1889.

Application filed July 5, 1888.

T at whom it may concern.-

Be itknown that "I, HIRAM O. GILBERT, a citizen of the United States,residing at Burlington, in the county of Ohittenden and State ofVermont, have invented certain new and useful Improvements in Machinesfor Grindin g Shimer Molding and Sash Heads and other Circular Bits ofMatcher-Heads, of which the u following is a specification, referencebeing mandrel passes, a revolving block by which the mandrel is adjustedvertically, a handle for horizontally revolving the adj listing-block,and a carriage by means of which the head is moved back and forth inrelation to the emery-wheel, as will be more fully describedhereinafter.

The object of my invention is to provide a machine by means of which thecircular bits of matcher-heads can be quickly and accurately sharpened,and all of those portions of the circular bits which are upon the sameplane or line can be alternatelysharpened by simply revolving the headto which they are attached in relation to the emerywheel.

The accompanying drawing represents a perspective of a machine embodyingmy invention.

I represents a suitable carriage, which is adapted to be movedhorizontally back and forth in relation to the emery-wheel B by means ofthe hand-wheel W and the shaft to which the wheel is secured. The"carriage I, which may be of any ordinary construction, and which hasonly an endwise movement, has mounted upon its top a suitable support,upon the top of which is mounted the handle F, the adjusting-block D,and the mandrelframe E. The mandrel-frame is made circular at its upperend, and passing horizontally through it is the mandrel A, which is pro-Vided with the hand-wheel O at one end, and

Serial No. 279,014. (No model.)

upon which the head H, carrying the rotary cutter, is placed. The shankof the frame E is made screw threaded and passes down through theadjusting block D, which is adapted to be revolved by means of adetachable handle, which is adapted to catch in the openings in itsside, and thus raise or lower the frame E, carrying the mandrel A, andthe head H, placed upon it. This block D rests upon the handle F, sothat when the clamping-screw N is loosened the handle can be turnedpartially around, carrying the block, the frame, and the mandrel withit, thus adjusting the head H into any desired relation to the wheel B.The clamping-screw N passes down through a slot in the support M, forthe purpose of locking the handle F in any desired position, and thehandle F can be moved horizontally around the length of this slot, andthus turning the mandrel and its frame in any desired direction. Risingabove the carriage at one side are the two standards P, each of whichare made in two parts and the upper parts of which are verticallyadjustable, so that the wheel B can be adjusted in relation to the headH. This wheel is secured to a shaft, which is j ournaled upon the upperends of the bearings P, and which is provided with a drivingpulley, S,atits center. The wheel B, having been adjusted in relation to the bits,and the head having been turned in to the desired position, all thoseportions of the bits which are upon the same circle can be sharpenedalternately and with great rapidity and the utmost precision. After oneportion of all the bits have been sharpened the head and wheel can begiven anyother adjustment necessary, and thenthe other portions of thecutting-edges of the bits also sharpened.

By means of the construction here shown and described all of thedifficulty of sharpening bits having uneven cutting-edges is entirelydone away with. It is only necessary to place the head I-l upon themandrel and then turn the mandrel into the desired position to properlypresent the bits to the wheel, and as fast as one bit has been sharpenedturn' the mandrel so as to present another bit.

Having thus described my invention, I

claimin g-block by which the frame is adjusted vertically, a handle forturning the frame horizontally around, a locking-screw for holding thehandle in any desired position, and a reoiproeatin g carriage,substantially as set forth.

In testimony whereof I do affix my signature in presence of twowitnesses.

IIIRAM C. GILBERT.

Witnesses:

HARMON S. GRAVES, CHARLES E. ALLEN.

